While not directly in the "audio path," it is vital for flow. It converts AC house current into the DC voltage (B+) required by the other four tubes to function. ⚠️ Critical Safety Note
The signal travels through an Output Transformer (to match impedance) and into the Speaker . 5. Rectifier (The Power Supply) Tube: 35Z5 (or 35W4) AA5 Radio Signal Flow
use an Isolation Transformer when working on the signal flow with test equipment. How can I help you further with this project? While not directly in the "audio path," it is vital for flow
It gives the tiny audio signal its first small boost. 4. Audio Power Output Stage Tube: 50L6 (or 50C5) AA5 Radio Signal Flow
This stage focuses purely on the 455 kHz signal. It uses IF Transformers to filter out everything except the desired station.